JP3141089B2 - Temperature control device for water-cooled internal combustion engine - Google Patents
Temperature control device for water-cooled internal combustion engineInfo
- Publication number
- JP3141089B2 JP3141089B2 JP02045640A JP4564090A JP3141089B2 JP 3141089 B2 JP3141089 B2 JP 3141089B2 JP 02045640 A JP02045640 A JP 02045640A JP 4564090 A JP4564090 A JP 4564090A JP 3141089 B2 JP3141089 B2 JP 3141089B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- internal combustion
- combustion engine
- cooling water
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 67
- 239000000498 cooling water Substances 0.000 claims description 35
- 235000014676 Phragmites communis Nutrition 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000002730 additional effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
- F01P3/202—Cooling circuits not specific to a single part of engine or machine for outboard marine engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/04—Lubricant cooler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/10—Fuel manifold
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
Landscapes
- Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、船外機用水冷２サイクル内燃機関に関す
る。Description: TECHNICAL FIELD The present invention relates to a water-cooled two-stroke internal combustion engine for an outboard motor.
［従来の技術］ 船外機用内燃機関等の水冷内燃機関は、機関の燃焼室
まわりに水ジャケットを設けるとともに、該水ジャケッ
トに冷却水を圧送する水ポンプを備えて構成されてい
る。2. Description of the Related Art A water-cooled internal combustion engine such as an internal combustion engine for an outboard motor is provided with a water jacket around a combustion chamber of the engine and a water pump for pumping cooling water to the water jacket.
［発明が解決しようとする課題］ 然るに、船外機用水冷２サイクル内燃機関では、機関
運転時の騒音を低減することが望まれる。[Problems to be Solved by the Invention] However, in a water-cooled two-stroke internal combustion engine for an outboard motor, it is desired to reduce noise during engine operation.
本発明の課題は、船外機用水冷２サイクル内燃機関に
おいて、機関運転時の騒音を低減することにある。An object of the present invention is to reduce noise during engine operation in a water-cooled two-stroke internal combustion engine for an outboard motor.
［課題を解決するための手段］ 請求項１に記載の本発明は、上下方向に延びるクラン
ク軸を収容するクランク室をシリンダブロックと協同し
て画成すると共に、給気箱をスロットル弁を介してクラ
ンク室に連通し、リード弁を内部に有する通路が設けら
れたクランクケースを備え内燃機関に設けた冷却水通路
に冷却水を圧送する水ポンプを内燃機関の下方に備え、
カウリングで覆われた船外機用水冷２サイクル内燃機関
において、前記クランクケースのリード弁を内部に有す
る通路の左右両側に上下方向に延びる冷却水通路を設
け、その冷却水通路に前記水ポンプで圧送される冷却水
を供給するようにしたものである。Means for Solving the Problems According to the present invention, a crank chamber for accommodating a vertically extending crankshaft is defined in cooperation with a cylinder block, and an air supply box is provided via a throttle valve. A water pump for communicating cooling water to a cooling water passage provided in the internal combustion engine including a crankcase provided with a passage having a reed valve therein is provided below the internal combustion engine.
In a water-cooled two-stroke internal combustion engine for an outboard motor covered with a cowling, a cooling water passage extending vertically is provided on both left and right sides of a passage having a reed valve of the crankcase therein, and the water pump is provided in the cooling water passage. This is to supply cooling water to be pumped.
請求項２に記載の本発明は、請求項１に記載の本発明
において更に、前記内燃機関の高負荷時に、前記水ポン
プからの冷却水を、内燃機関の燃焼室の周囲の冷却水通
路を通さずに、前記クランクケースのリード弁を内部に
有する通路の左右両側にて上下方向に延びる冷却水通路
に圧送するようにしたものである。According to a second aspect of the present invention, in the first aspect of the invention, when the internal combustion engine is under a high load, cooling water from the water pump is supplied to a cooling water passage around a combustion chamber of the internal combustion engine. Instead of passing through, a reed valve of the crankcase is pressure-fed to a cooling water passage extending vertically on both left and right sides of a passage inside the reed valve.
［作用］ 請求項１の発明によれば下記の作用がある。[Operation] According to the first aspect of the invention, the following operation is provided.
クランクケースのリード弁を内部に有する通路の左右
両側に上下方向に延びる冷却水通路を設けたので、この
冷却水通路を通る冷却水が水壁となり、リード弁の開閉
による給気の放射騒音を低減できる。Since cooling water passages extending vertically are provided on both the left and right sides of the passage having the reed valve of the crankcase inside, the cooling water passing through the cooling water passage becomes a water wall, and the radiation noise of the supply air due to the opening and closing of the reed valve is reduced. Can be reduced.
請求項２の発明によれば下記の作用がある。 According to the second aspect of the invention, the following operation is provided.
高負荷時に、クランクケースのリード弁を内部に有す
る通路の左右両側に上下方向に延びる冷却水通路に冷却
水が供給される結果、このリード弁を有する通路を通る
空気が冷却されて高密度化し、機関燃焼室への充填空気
量を増加し、出力向上を図ることができる。When the load is high, the cooling water is supplied to the cooling water passage extending vertically on both the left and right sides of the passage having the reed valve of the crankcase.As a result, the air passing through the passage having the reed valve is cooled and the density is increased. Thus, the amount of air charged into the engine combustion chamber can be increased, and the output can be improved.
［実施例］ 第１図は本発明の一実施例が適用された船外機を示す
側面図、第２図は第１図の内燃機関を示す横断面図、第
３図は給水制御回路を示す模式図である。FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, FIG. 2 is a cross-sectional view showing the internal combustion engine of FIG. 1, and FIG. FIG.
船外機10は、第１図、第２図に示す如く、船体11にク
ランプブラケット12を着脱でき、クランプブラケット12
にチルト軸13を介してスイベルブラケット14を傾動可能
に支持し、スイベルブラケット14に転舵軸を介して推進
ユニット15を転舵可能に支持している。As shown in FIG. 1 and FIG. 2, the outboard motor 10 is capable of attaching and detaching a clamp bracket 12 to and from a hull 11.
A swivel bracket 14 is tiltably supported via a tilt shaft 13 and a propulsion unit 15 is supported on the swivel bracket 14 via a steered shaft so as to be steerable.
推進ユニット15は、推進ケーシング16の上部に内燃機
関17を搭載し、内燃機関17の上下方向に延びるクランク
軸18に連結されるドライブ軸19、前後進切換歯車列20、
プロペラ軸21を介して、プロペラ22を駆動可能としてい
る。The propulsion unit 15 has an internal combustion engine 17 mounted on an upper part of a propulsion casing 16, a drive shaft 19 connected to a crankshaft 18 extending in a vertical direction of the internal combustion engine 17, a forward / reverse switching gear train 20,
The propeller 22 can be driven via the propeller shaft 21.
内燃機関17は、２サイクル内燃機関であり、シリンダ
ブロック23、シリンダヘッド24、クランクケース25にて
機関本体を形成している。第１図、第２図において、26
はピストン、27は連接棒、28は燃焼室、29は点火プラ
グ、30は排気通路、30Aは推進ケーシング16内の排気膨
張室16Aに開口する排気マフラーである。又、第１図、
第２図において、31は掃気通路、32はシリンダブロック
23とクランクケース25の協同で画成され、クランク軸18
を収容するクランク室、33はリード弁、34は気化器、35
は給気箱、34Aは気化器34のスロットル弁である。クラ
ンクケース25は、給気箱35をスロットル弁34Aを介して
クランク室32に連通し、内部にリード弁33を有する通路
を設ける。The internal combustion engine 17 is a two-stroke internal combustion engine, and a cylinder block 23, a cylinder head 24, and a crankcase 25 form an engine main body. In FIG. 1 and FIG.
Is a piston, 27 is a connecting rod, 28 is a combustion chamber, 29 is a spark plug, 30 is an exhaust passage, and 30A is an exhaust muffler opening to an exhaust expansion chamber 16A in the propulsion casing 16. Also, FIG.
In FIG. 2, 31 is a scavenging passage, and 32 is a cylinder block.
23 and the crankcase 25 in cooperation with the crankshaft 18
, A crankcase for accommodating 33, a reed valve, 34 a carburetor, 35
Is an air supply box, and 34A is a throttle valve of the carburetor 34. The crankcase 25 communicates the air supply box 35 with the crank chamber 32 via a throttle valve 34A, and provides a passage having a reed valve 33 therein.
36はカウリングであり、雨水、海水の飛散から内燃機
関17を保護するとともに、内燃機関17のための燃焼用空
気を取入れるための空気取入口（不図示）を備えてい
る。A cowling 36 protects the internal combustion engine 17 from scattering of rainwater and seawater, and has an air intake (not shown) for taking in combustion air for the internal combustion engine 17.
内燃機関17は、シリンダブロック23、シリンダヘッド
24の燃焼室28まわりに水ジャケット37を備えるととも
に、クランクケース25のクランク室32まわりに水路38を
備える。このとき、水路38は、クランクケース25のリー
ド弁33を内部に有する通路の左右両側に、上下方向に延
びるように設けられる。The internal combustion engine 17 includes a cylinder block 23, a cylinder head
A water jacket 37 is provided around 24 combustion chambers 28, and a water passage 38 is provided around the crank chamber 32 of the crankcase 25. At this time, the water passages 38 are provided on both left and right sides of the passage having the reed valve 33 of the crankcase 25 therein so as to extend in the vertical direction.
そして、内燃機関17は、水ジャケット37、水路38に冷
却水を圧送できる水ポンプ39を備えている。水ポンプ39
は、推進ケーシング16の内部のドライブ軸19まわりに配
設され、内燃機関17の運転に連動して駆動され、推進ケ
ーシング16の側面に設けた水取入口40から吸込んだ外部
冷却水を、給水路41から水ジャケット37、水路38の側に
圧送する。The internal combustion engine 17 includes a water jacket 37 and a water pump 39 that can pump cooling water to the water channel 38. Water pump 39
Is provided around a drive shaft 19 inside the propulsion casing 16, is driven in conjunction with the operation of the internal combustion engine 17, and supplies external cooling water sucked from a water intake 40 provided on a side surface of the propulsion casing 16. The water is fed from the channel 41 to the water jacket 37 and the channel 38.
この時、内燃機関17は、スロットル弁開度センサ42を
備え、内燃機関17の負荷状態を検出することとしてい
る。At this time, the internal combustion engine 17 includes a throttle valve opening sensor 42, and detects the load state of the internal combustion engine 17.
又、内燃機関17は、内燃機関17の負荷状態により、水
ポンプ39が圧送する冷却水を水ジャケット37と水路38の
いずれから先に供給するかの給水順序を制御できる給水
制御回路43を備えている。給水制御回路43は、水ジャケ
ット37と水路38のそれぞれを、水ポンプ39の給水路41と
第１排水路44のそれぞれに切換え接続する切換弁45と、
切換弁45のための弁駆動装置46と、スロットル弁開度セ
ンサ42の検出結果を得て弁駆動装置46を制御する制御ユ
ニット47とを有して構成されている。この時、水ジャケ
ット37と水路38とは連通管48により接続されている。Further, the internal combustion engine 17 includes a water supply control circuit 43 which can control a water supply order of the cooling water pumped by the water pump 39 from the water jacket 37 or the water channel 38 depending on the load state of the internal combustion engine 17. ing. The water supply control circuit 43 includes a switching valve 45 that switches and connects each of the water jacket 37 and the water path 38 to each of the water supply path 41 and the first drain path 44 of the water pump 39,
A valve drive unit 46 for the switching valve 45 and a control unit 47 that obtains the detection result of the throttle valve opening sensor 42 and controls the valve drive unit 46 are provided. At this time, the water jacket 37 and the water channel 38 are connected by the communication pipe 48.
即ち、給水制御回路43は、（Ａ）スロットル弁開度セ
ンサ42が検出する内燃機関17の低負荷時には、水ポンプ
39が圧送する冷却水を水ジャケット37経由で水路38に供
給可能とし（第３図（Ａ）参照）、（Ｂ）高負荷時に
は、水ポンプ39が圧送する冷却水を上記水路38経由で上
記水ジャケット37に供給可能とする。That is, when the load of the internal combustion engine 17 is low when the throttle valve opening sensor 42 detects (A) the water pump
The cooling water pumped by the pump 39 can be supplied to the water channel 38 via the water jacket 37 (see FIG. 3 (A)). (B) At high load, the cooling water pumped by the water pump 39 is supplied via the water channel 38 It can be supplied to the water jacket 37.
尚、給水制御回路43にあっては、水ポンプ39の給水路
41と第１排水路44とを第１絞り51を介して連通し、第１
排水路44を排気膨張室16Aに開口している。又、水ジャ
ケット37の前記連通管48が接続される部位には、サーモ
スタット弁52と圧力制御弁53とが並列配置されている。
又、水ジャケット37と連通管48との接続部には更に第２
排出路54が接続され、第２排出路54は第２絞り55を介し
て排気膨張室16Aに開口している。In the water supply control circuit 43, the water supply passage of the water pump 39 is provided.
The first drain 41 is communicated with the first drainage channel 44 via the first throttle 51,
The drain passage 44 is open to the exhaust expansion chamber 16A. Further, a thermostat valve 52 and a pressure control valve 53 are arranged in parallel at a portion of the water jacket 37 where the communication pipe 48 is connected.
In addition, the connecting portion between the water jacket 37 and the communication pipe 48 has a second
The discharge passage 54 is connected, and the second discharge passage 54 opens to the exhaust expansion chamber 16A via the second throttle 55.
次に、上記給水制御回路43の作動について説明する。 Next, the operation of the water supply control circuit 43 will be described.
（１）スロットル弁開度小（低負荷）かつエンジン温度
低い場合 低負荷時であるから切換弁45は水ポンプ39を水ジャケ
ット37に接続しているが、サーモスタット弁52が閉であ
るから、冷却水は第１絞り51を通って直接排気膨張室16
Aへ排出される。(1) When the throttle valve opening is small (low load) and the engine temperature is low At low load, the switching valve 45 connects the water pump 39 to the water jacket 37, but since the thermostat valve 52 is closed, The cooling water passes directly through the first throttle 51 to the exhaust expansion chamber 16.
It is discharged to A.
（２）スロットル弁開度小（低負荷）かつエンジン温度
高い場合 低負荷域であるから、切換弁45は水ポンプ39を水ジャ
ケット37に接続しており、サーモスタット弁52が開であ
るから、冷却水は水ジャケット37を経由した後、一部は
第２絞り55を通って第２排水路54から排気膨張室16Aへ
排出され、他の一部はクランク室32まわりの水路38を経
て第１排水路44から排気膨張室16Aへ排出される。(2) When the throttle valve opening is small (low load) and the engine temperature is high Since the load is low, the switching valve 45 connects the water pump 39 to the water jacket 37 and the thermostat valve 52 is open. After passing through the water jacket 37, a part of the cooling water is discharged from the second drain passage 54 to the exhaust expansion chamber 16A through the second throttle 55, and another part is passed through the water passage 38 around the crank chamber 32. The water is discharged from the drainage channel 44 to the exhaust expansion chamber 16A.
（３）スロットル弁開度大（高負荷）かつエンジン温度
低い場合 高負荷域であるから、切換弁45は水ポンプ39を水路38
に接続しており、他方サーモスタット弁52は閉である。
冷却水の一部は、第１絞り51を通って直接排気膨張室16
Aへ排出され、他の一部は、クランク室32まわりの水路3
8を経た後、第２絞り55を通って第２排水路54から排気
膨張室16Aへ排出される。(3) In the case where the throttle valve opening is large (high load) and the engine temperature is low. In the high load region, the switching valve 45 connects the water pump 39 to the water channel 38.
, While the thermostat valve 52 is closed.
Part of the cooling water passes directly through the first throttle 51 to the exhaust expansion chamber 16.
A part of the water is discharged to A
After passing through 8, the air is discharged from the second drain passage 54 to the exhaust expansion chamber 16A through the second throttle 55.
（４）スロットル弁開度大（高負荷）かつエンジン温度
高い場合 高負荷域であるから切換弁45は水ポンプ39を水路38に
接続しており、他方サーモスタット弁52は開である。冷
却水の一部は、第１絞り51を通って直接排気膨張室16A
へ排出され、他の一部は、クランク室32まわりの水路38
を経た後、水ジャケット37を通って第１排水路44から排
気膨張室16Aへ排出される。尚、水路38を経た冷却水の
一部は、第２絞り55を通って第２排水路54から排気膨張
室16Aへ排出される。(4) When the throttle valve opening is large (high load) and the engine temperature is high Since the load is high, the switching valve 45 connects the water pump 39 to the water passage 38, while the thermostat valve 52 is open. Part of the cooling water passes directly through the first throttle 51 to the exhaust expansion chamber 16A.
And a part of the water is discharged to the channel 38 around the crankcase 32.
After that, the water is discharged from the first drain passage 44 to the exhaust expansion chamber 16A through the water jacket 37. A part of the cooling water passing through the water passage 38 is discharged from the second drain passage 54 to the exhaust expansion chamber 16A through the second throttle 55.
次に、上記実施例の作用について説明する。 Next, the operation of the above embodiment will be described.
（Ａ）低負荷時には、水ジャケット37を経由することに
て燃焼室28まわりの熱を奪い暖かくなった水が、クラン
ク室32まわりの水路38に供給される結果、クランク室32
を通過する燃料の気化を促進し、燃焼の安定化を図るこ
とができる。(A) When the load is low, warm water that has taken heat around the combustion chamber 28 by passing through the water jacket 37 and is supplied to the water passage 38 around the crank chamber 32 results in the crank chamber 32
This promotes vaporization of the fuel passing therethrough, and stabilizes combustion.
（Ｂ）他方、高負荷域において、冷却水はまずクランク
室32まわりの水路38を経由してクランク室32まわりを冷
却した後、燃焼室28まわりの水ジャケット37に入り、燃
焼室28まわりの熱を奪う。即ち、水ポンプ39による圧送
直後の昇温していない冷却水にてクランク室32を通過す
る空気を冷却することにて高密度化し、燃焼室28への充
填空気量を増加し出力向上を図ることができる。(B) On the other hand, in the high load region, the cooling water first cools around the crank chamber 32 through the water passage 38 around the crank chamber 32, and then enters the water jacket 37 around the combustion chamber 28, where it cools around the combustion chamber 28. Take away the heat. That is, the density of the air passing through the crank chamber 32 is increased by cooling the air passing through the crank chamber 32 with the cooling water that has not been heated immediately after the pumping by the water pump 39, the amount of air charged into the combustion chamber 28 is increased, and the output is improved. be able to.
（Ｃ）尚、クランク室32まわりの水路38に供給される冷
却水は水壁となり、給気の放射騒音を低減するという付
随的効果も有する。(C) The cooling water supplied to the water passage 38 around the crank chamber 32 becomes a water wall, and has an additional effect of reducing radiation noise of the supply air.
（Ｄ）船外機10にあっては、内燃機関17をカウリング36
にて覆っている。このため、内燃機関17の暖機後の高負
荷運転時には、カウリング36の内部雰囲気が高温とな
り、内燃機関17に供給される燃焼用空気は外気より更に
高温となり、充填効率が低下する虞れがある。然るに、
上記実施例によれば、この燃焼用空気を高負荷時に冷却
することから、その充填効率の低下を回避し向上でき
る。(D) In the outboard motor 10, the internal combustion engine 17 is
It is covered with. For this reason, at the time of high load operation after the internal combustion engine 17 is warmed up, the internal atmosphere of the cowling 36 becomes high temperature, and the combustion air supplied to the internal combustion engine 17 becomes higher temperature than the outside air, which may lower the charging efficiency. is there. Anyway,
According to the above embodiment, since the combustion air is cooled under a high load, it is possible to avoid and reduce the charging efficiency.
尚、本発明の実施において、負荷状態検出器は内燃機
関17の回転速度検出器等の他の手段によるものであって
も良い。In the embodiment of the present invention, the load state detector may be based on another means such as a rotational speed detector of the internal combustion engine 17.
［発明の効果］ 以上のように本発明によれば、船外機用水冷内燃機関
の高負荷域において、機関燃焼室への充填空気量を増加
し出力向上を図るとともに、給気の放射騒音の低減を図
ることができる。[Effects of the Invention] As described above, according to the present invention, in a high load region of a water-cooled internal combustion engine for an outboard motor, the amount of air charged into the engine combustion chamber is increased to improve the output, and the radiation noise of the supply air is improved. Can be reduced.
第１図は本発明の一実施例が適用された船外機を示す側
面図、第２図は第１図の内燃機関を示す横断面図、第３
図は給水制御回路を示す模式図である。 10……船外機 17……内燃機関、 23……シリンダブロック、 24……シリンダヘッド、 26……クランクケース、 28……燃焼室、 32……クランク室（給気通路）、 36……カウリング 37……水ジャケット、 38……水路、 39……水ポンプ、 42……スロットル弁回路センサ、 43……給水制御回路、 45……切換弁。FIG. 1 is a side view showing an outboard motor to which one embodiment of the present invention is applied, FIG. 2 is a cross-sectional view showing the internal combustion engine of FIG.
The figure is a schematic diagram showing a water supply control circuit. 10 Outboard motor 17 Internal combustion engine 23 Cylinder block 24 Cylinder head 26 Crankcase 28 Combustion chamber 32 Crank chamber (air supply passage) 36 36 Cowling 37 ... water jacket, 38 ... water channel, 39 ... water pump, 42 ... throttle valve circuit sensor, 43 ... water supply control circuit, 45 ... switching valve.
Claims (2)
ランク室をシリンダブロックと協同して画成すると共
に、給気箱をスロットル弁を介してクランク室に連通
し、リード弁を内部に有する通路が設けられたクランク
ケースを備え、 内燃機関に設けた冷却水通路に冷却水を圧送する水ポン
プを内燃機関の下方に備え、 カウリングで覆われた船外機用水冷２サイクル内燃機関
において、 前記クランクケースのリード弁を内部に有する通路の左
右両側にて上下方向に延びる冷却水通路を設け、その冷
却水通路に前記水ポンプで圧送される冷却水を供給する
ことを特徴とする船外機用水冷２サイクル内燃機関。1. A passage having a crankshaft accommodating a vertically extending crankshaft cooperating with a cylinder block, communicating an air supply box with the crankcase via a throttle valve, and having a reed valve therein. A water pump for pumping cooling water to a cooling water passage provided in the internal combustion engine is provided below the internal combustion engine, and a water-cooled two-cycle internal combustion engine for an outboard motor covered with a cowling is provided. An outboard motor provided with a cooling water passage extending vertically on both left and right sides of a passage having a reed valve of a crankcase therein, and supplying cooling water pumped by the water pump to the cooling water passage. Water-cooled two-cycle internal combustion engine.
からの冷却水を、内燃機関の燃焼室の周囲の冷却水通路
を通さずに、前記クランクケースのリード弁を内部に有
する通路の左右両側にて上下方向に延びる冷却水通路に
圧送する請求項１記載の船外機用水冷２サイクル内燃機
関。2. When the internal combustion engine is under a high load, the cooling water from the water pump is not allowed to pass through a cooling water passage around a combustion chamber of the internal combustion engine. The water-cooled two-stroke internal combustion engine for an outboard motor according to claim 1, wherein the water is pressure-fed to a cooling water passage extending vertically on both left and right sides.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02045640A JP3141089B2 (en) | 1990-02-28 | 1990-02-28 | Temperature control device for water-cooled internal combustion engine |
| US07/662,258 US5109809A (en) | 1990-02-28 | 1991-02-28 | Temperature control system for a water-cooled internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02045640A JP3141089B2 (en) | 1990-02-28 | 1990-02-28 | Temperature control device for water-cooled internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03249368A JPH03249368A (en) | 1991-11-07 |
| JP3141089B2 true JP3141089B2 (en) | 2001-03-05 |
Family
ID=12724969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02045640A Expired - Fee Related JP3141089B2 (en) | 1990-02-28 | 1990-02-28 | Temperature control device for water-cooled internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5109809A (en) |
| JP (1) | JP3141089B2 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3422811B2 (en) * | 1993-01-13 | 2003-06-30 | ヤマハマリン株式会社 | Fuel injection engine |
| US5381763A (en) * | 1993-09-28 | 1995-01-17 | Outboard Marine Corporation | Dry head cooling system |
| US5555855A (en) * | 1994-01-11 | 1996-09-17 | Sanshin Kogyo Kabushiki Kaisha | Water circulation system for marine engine |
| US5876256A (en) * | 1996-03-11 | 1999-03-02 | Sanshin Kogyo Kabushiki Kaisha | Engine cooling system |
| JP3765606B2 (en) * | 1996-03-19 | 2006-04-12 | ヤマハ発動機株式会社 | Water vehicle cooling system |
| US5893783A (en) * | 1996-05-15 | 1999-04-13 | Sanshin Kogyo Kabushiki Kaisha | Outboard motor exhaust system |
| JPH09309497A (en) * | 1996-05-25 | 1997-12-02 | Sanshin Ind Co Ltd | Cooling device for outboard motor |
| JP3765900B2 (en) * | 1997-02-03 | 2006-04-12 | 本田技研工業株式会社 | Outboard engine cooling system |
| JP4003856B2 (en) | 1998-11-30 | 2007-11-07 | ヤマハマリン株式会社 | Outboard motor |
| EP1024265B1 (en) | 1999-01-26 | 2006-05-31 | Yamaha Marine Kabushiki Kaisha | Internal combustion engine and use of internal combustion engine |
| JP4229249B2 (en) * | 1999-03-30 | 2009-02-25 | 本田技研工業株式会社 | 2-cycle engine and ship equipped with it |
| JP4485647B2 (en) | 2000-04-19 | 2010-06-23 | ヤマハ発動機株式会社 | Outboard engine |
| JP4386397B2 (en) | 2000-09-13 | 2009-12-16 | ヤマハ発動機株式会社 | Water pressure regulator for cooling internal combustion engine in outboard motor |
| US9353694B2 (en) * | 2013-06-17 | 2016-05-31 | GM Global Technology Operations LLC | Intake temperature control systems and methods for intake manifold protection |
| JP2015131613A (en) * | 2014-01-15 | 2015-07-23 | 株式会社浪速ポンプ製作所 | Vessel cooling system |
| US11072408B1 (en) * | 2019-09-09 | 2021-07-27 | Brunswick Corporation | Marine engines and cooling systems for cooling lubricant in a crankcase of a marine engine |
| US11286027B1 (en) * | 2019-09-09 | 2022-03-29 | Brunswick Corporation | Marine engines and cooling systems for cooling lubricant in a crankcase of a marine engine |
| US11352937B1 (en) | 2021-02-08 | 2022-06-07 | Brunswick Corporation | Marine drives and cooling systems for marine drives having a crankcase cooler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1958156A (en) * | 1930-09-29 | 1934-05-08 | William B Whelan | Internal combustion engine |
-
1990
- 1990-02-28 JP JP02045640A patent/JP3141089B2/en not_active Expired - Fee Related
-
1991
- 1991-02-28 US US07/662,258 patent/US5109809A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5109809A (en) | 1992-05-05 |
| JPH03249368A (en) | 1991-11-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |